The Helena River is a tributary of the Swan River, Western Australia View from Kings Park over Perth Water Location of the Swan River, with Canning River in light blue The Swan River estuary flows through the city of Perth, in the south west of Western Australia. ...

Location

It rises in country east of Mount Dale and moves to the north west to Mundaring Weir, where it is dammed. It then flows west until it reaches the Darling Scarp.

It passes through the western edge of the Darling Scarp between Gooseberry Hill, and Greenmount Hill before joining the Swan River at the southern edge of the historic town of Guildford. The Darling Scarp or Darling Range is a low escarpment running North-South to the East of Perth, Western Australia. ...

Environment

In the higher ground the Helena River passes mainly through National Park or reserve. This has been beneficial for some of the catchment area, as it has been an important buffer between the urban settlements in the Mundaring and Kalamunda areas. The flora of the Helena valley has been recognised as being of importance because of the relative richness.

It is only at Darlington, and the locality known as Helena Valley that there is housing and agriculture close to its banks before it emerges out on to the Swan Coastal Plain.

At Bellevue and Midland the river has historically passed hazardous industrial sites. This includes the Midland Railway Workshop site. Bellevue is a small locality on the western border of the Shire of Mundaring, Western Australia, or the eastern border of the City of Swan Located at the foot of the slopes of Greenmount, a landmark on the Darling Scarp that is noted in the earliest of travel journals of... Midland is a town in Ontario, Canada Midland is also the name of some places in the United States of America: Midland, Midland, Georgia Midland, Midland, Michigan Midland, Midland, North Carolina Midland, Midland, Pennsylvania Midland, Midland, Texas Midland, Midland, Virginia Midland City, Midland City, Alabama Midland Park, Midland Park, Virginia...

Dams

It is dammed in two places - the best known is the upper river dam known as Mundaring weir which was part of C.Y O'Connor's Goldfield Water Scheme. The lower dam is west of Mundaring weir in a very restricted area where access is limited. Mundaring Weir is a dam across the Helena River, in Western Australia. ... C. Y. OConnor Charles Yelverton OConnor (1842- d. ...

Since the lower dam has been constructed in the 1970's, flooding of the lower Helena River (in East Guildford and Guildford) has been substantially reduced.